设立消防服务中介机构之探讨

随着行政体制改革的深入,将公安消防机构部分技术监督职能转移到中介服务机构,有助于消防工作水平的整体提高。构想了消防服务中介机构的概念、业务范围、法律性质、设立条件、运行模式等,探讨了在运行中可能出现的问题及对策。     

对消防装备建设的思考

根据调研所掌握的消防装备基本情况,指出消防装备建设中存在的问题,分析产生问题的原因,提出加强消防装备建设的对策。     

析替代国制度的不公平性及对策

替代国制度是西方国家反倾销法中确定“非市场经济国家”出口产品正常价值所使用的方法,这种方法完全不考虑出口国产品的成本优势。因此,以这种方法确定出口产品的正常价值是非常不合理的,致使中国在反倾销诉讼中处于极为不利的地位。替代国制度的产生及根源,替代国制度对中国的损害及不公平性,中国应采取的对策。     

Heart analytics: Analytical modeling of cardiovascular care

Cardiovascular diseases (CVDs) are the leading cause of death and disability both in the United States and worldwide. Despite high morbidity, mortality, and cost in the United States and global healthcare systems, cardiovascular care has been understudied in the healthcare operations management literature. In this paper, we identify research opportunities for healthcare operations management scholars to aid in improving cardiovascular care. We focus on three burdensome conditions, including (1) coronary artery disease, (2) stroke, and (3) heart failure, which, collectively, lead to the vast majority of CVD‐caused mortality and disability. For each condition, we characterize a typical patient's journey in receiving cardiovascular care, elucidating key challenges in improving care and outlining research questions for healthcare operations management scholars. We close with a reference to new research opportunities that emerge as artificial intelligence is likely to transform much of cardiovascular care.     

中立型泛函微分方程的周期解

综合利用D算子的性质及Horn不动点定理[8],研究了有限时滞中立型泛函微分方程的周期解的存在性问题,证明了解的一致最终有界性蕴含周期解的存在性,从而推广了著名的Yoshizawa周期解定理[3],同时推广了[1]和[2]的主要结果.     

An optimal critical level policy for inventory systems with two demand classes

Traditional inventory systems treat all demands of a given item equally. This approach is optimal if the penalty costs of all customers are the same, but it is not optimal if the penalty costs are different for different customer classes. Then, demands of customers with high penalty costs must be filled before demands of customers with low penalty costs. A commonly used inventory policy for dealing with demands with different penalty costs is the critical level inventory policy. Under this policy demands with low penalty costs are filled as long as inventory is above a certain critical level. If the inventory reaches the critical level, only demands with high penalty costs are filled and demands with low penalty costs are backordered. In this article, we consider a critical level policy for a periodic review inventory system with two demand classes. Because traditional approaches cannot be used to find the optimal parameters of the policy, we use a multidimensional Markov chain to model the inventory system. We use a sample path approach to prove several properties of this inventory system. Although the cost function is not convex, we can build on these properties to develop an optimization approach that finds the optimal solution. We also present some numerical results. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

超声速转弯流道内迟滞现象的初步研究

采用特征线法,通过预先给定中心线马赫数分布,设计了消波的二维超声速转弯流道。研究了不同反压作用下转弯流道内的激波串结构、壁面沿程静压分布和壁面分离区演化等特征,分析了流道内激波串波结构与反压的关系,发现了激波串波头很难稳定在流道拐点附近。当激波串波头靠近流道拐点时,流场具有双解。流动双解区向单解区演化过程中,伴随有大分离区在上、下壁面之间的迅速转换和激波串结构的快速演化。     

火灾事故调查的现状与对策

阐述当前我国火灾事故调查现状 ,分析当前火灾事故调查工作存在的问题 ,并提出了加强火灾事故调查工作的建议。     

高阶拟线性椭圆型方程的非平凡解

设ΩR~n是有界区域。本文讨论高阶拟线性椭圆型方程的非平凡解。 sum from|α|≤m (-1)~(|α|)D~a(F_a(x,u,…,D~mu))=0,x∈Ω(1) 其中α=(α_1,α_2,…,α_n),F_α=F_D~a_u=D~αu=D~ou=u,|α|=0。当F_α满足条件(F_1)-(F_4)时,证明了在Sobolev空间W_0~m,p(Ω)内存在非平凡解。     

新型水陆坦克系统效能评估模型研究

在提出一种新型水陆坦克的基础上,研究了其作战任务剖面,提出其作战使用性能要求,建立了一套科学评估的方法体系——综合效能多指标评价法,将各种评价方法——层次分析法、灰色评估法、模糊综合评判、Delphi法等融为一体,建立了新型水陆坦克系统效能评估的递阶层次分析模型,对新型水陆坦克和六三式水陆坦克的综合效能分别进行了系统评价,为高层领导对武器装备决策提供了科学的依据。